755 prompts matching "The imaginary unit i, and why i squared is minus one"
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Explain Back: The difference of two squares applied to surd conjugates
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Worked Example: Reading the symbol used for a binary operation
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Explain Back: A binary operation defined on the integers
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Worked Example: Testing the even numbers for closure under addition
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Worked Example: Finding the identity element from a rule such as a*b = a + b - 3
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Worked Example: The law for multiplying powers of the same base
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Explain Back: An indicial equation with the unknown in the exponent on both sides
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Explain Back: The logarithm of one, in any base
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Worked Example: The law for the logarithm of a quotient
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Worked Example: Writing out the terms of a sequence from its nth term
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Explain Back: Spotting the pattern in a sequence of squares or cubes
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Worked Example: Finding the common difference of an arithmetic progression
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Explain Back: Finding the first term from two given terms
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Worked Example: The alternative sum formula that uses the last term
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Worked Example: Finding the common ratio of a geometric progression
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Explain Back: Finding the first term from two given terms of a geometric progression
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Explain Back: The sum of a geometric progression with a negative common ratio
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Worked Example: Adding or subtracting the same number on both sides
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Worked Example: The critical values of a quadratic inequality
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Worked Example: Solving the equation modulus of x equals a
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